Germany manufactures the strongest artificial magnetic field to date

Researchers at the Rosendorf Research Center (HZDR) in Dresden, Helmholtz, Germany, created a magnetic field with a strength of 91.4 Tesla, breaking the 89 created by the Los Alamos National Laboratory a few years ago. Tesla's record has become the strongest artificial magnetic field in the world.

According to Joachim Vosnica, the head of the Dresden Strong Magnetic Laboratory affiliated with the center, this magnetic field strength is about 1.83 million times that of the earth ’s magnetic field strength (0.00005 Tesla). Medical nuclear magnetic resonance The magnetic field strength of the imager (0.5-3 Tesla) is nearly a hundred times. Although such a high magnetic field is also generated by the current passing through the copper coil, the strong magnetic field will affect the current to push the current away from the coil, and as the current increases, this thrust will increase. For ordinary copper coils, when the magnetic field strength reaches 25 Tesla, it will be torn apart. If the magnetic field strength can reach 100 Tesla, the pressure generated by the Lorentz force in the coil will be equivalent to 40,000 times the standard atmospheric pressure. This force can explode the entire coil like an explosion.

In order to overcome this problem, Shegel Zeltzen and colleagues at the Dresden Magnetomagnetic Laboratory created a double-layer coil weighing 200 kg. The outer part of the coil is covered by a steel sleeve, 55 cm high and 32 cm in diameter, which looks like a bucket.

In order to resist the Lorentz force generated by the strong magnetic field, the researchers used a special copper alloy coil, which can withstand a pressure equivalent to 10,000 times the standard air pressure. To further ensure strength, the researchers added a "safety jacket" to these alloys using special fibers that make bulletproof vests. With this structure, the specially-made coil instantaneously generated a magnetic field of 50 Tesla in 0.02 seconds.

But the magnetic field strength of 50 Tesla still can not meet the requirements of the experiment. To achieve greater magnetic field strength, the researchers added another 12 layers of copper coils outside the first layer of coils. Although this ordinary copper coil can only withstand the pressure equivalent to 2500 times the standard atmospheric pressure, but under the action of external binding materials, short-term current pulses also cause it to generate a magnetic field of about 40 Tesla. In the actual measurement, when the two coils are working at the same time, the device generates a magnetic field of 91.4 Tesla within a few milliseconds, and the coil is kept intact and not damaged during the entire process.

Vosnica said that although the device has set a world record in strength, what they really care about is its application prospects in the field of materials science. A stronger magnetic field means that scientists are testing new electronic components or superconductors, for example. Higher accuracy can be obtained. This research makes them the first research institution in the world that can conduct experiments with such a strong magnetic field.

Allegedly, after being informed of this news, many researchers in Germany and Europe came here admirably. Scientists in Japan and the United States also hope that HZDR can reserve experimental time for them to test their materials. At present, the five laboratories that can carry out the experiment have been unable to accept so many research projects, and the center has planned to build a sixth strong magnetic laboratory.

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